Our heroes are frequently confronted by the utterly absurd...
Yes, but it's equally utterly absurd that Spock should recognize the handwritten piano score as the work of Brahms. Doesn't matter, I love the episode anyway and always have. (To me the Brahmsiest part of the waltz is the aforementioned "bridge that's dialed way down," the contrasting material in a new key region.)
It would have been nice if the epidemic were days and not hours away from crisis point, but this was one of the final episodes and story editing was not on anyone's mind; people were looking for the exits and lining up other work.